The funny thing is that the best-selling Android tablet uses a heavily modified platform that bares little resemblance to the original Android operating system. And there was a time when you couldn't surf Google Play on the Kindle Fire even if you were using a browser. While you can now access Google's own app market from the Kindle Fire, the tablet's default is still the Amazon App Store.

The firm didn't analyze the reason behind those numbers, but it's easy to see why the Kindle Fire has been selling so well: Amazon's aggressive $199 pricing clearly continues to win over customers. And for those who want a tablet mainly for reading ebooks or for streaming Amazon Prime content, the Kindle Fire is the obvious choice. Of course, this may all change if and when Google releases an official tablet, but we'll just have to wait and see.